Many Ukrainian drones have been disabled by Russian jamming

AS UKRAINE’S STOCKS of artillery shells have dwindled, its army’s reliance on drones has grown. These are able to deliver ammunition with great precision over long distances—provided they can maintain connections with GPS satellites (so they know where they are) and their operators (so they know what to do). Such communication signals can be jammed, however, and Russia’s electronic warfare, as signals scrambling is known, is fearsomely effective. With large numbers of its drones in effect blinded, Ukraine’s drone technologists have been forced to get creative.